Constraining the nature of the Galactic center black hole Sgr A* with present and future observations. (arXiv:1209.0251v1 [astro-ph.HE])

Constraining the nature of the Galactic center black hole Sgr A* with present and future observations. (arXiv:1209.0251v1 [astro-ph.HE]):
The Galactic center is an ideal laboratory to study strong-field general
relativistic phenomena, as the supermassive black hole Sgr A* has the biggest
angular Schwarzschild radius among all black holes. This article presents three
different ways of using the immediate surroundings of Sgr A* as a probe in
order to either constrain its spin, or even test the very nature of this
compact object.